The space time correlations of natural wind are investigated using the horizontal windspeed fluctuation measured in the observation net work where the observational points are ar-ranged two-dimensionally. The isopleths of space correlation coefficients are approximatedby the ellipes. The fitness of this approximation is fairly good. The aspect ratio of these ellipsesis 3 to 4, when the averaging time of wind speed is 1.5 sec. The aspect ratio increases withthe wind speed and the averaging time. Talor's frozen eddy hypothesis is checked by com-paring the traveling distance of turbulent eddy. The traveling speed is estimated 1.14 timesof mean wind speed.